Sonic Electric Toothbrush Smart Toothbrush Ultrasonic Automatic Toothbrush USB Wireless Charging Adult Waterproof tooth brush S100Main FeaturesHigh cleaning frequency: max 39600 times/minHelp to improve scientific brushing habit: automatically stopped for 0.5 second every 30 seconds,and automatically turn off while reaching 2 minutes ( a suggested the best brushing period )Round brushing head + Dupond bristles : avoid hurt, deep cleaning includes dead cornerIPX7 full body waterproof level for direct washingAbout 60 days duration ( 2min/time, 2 times every day )Two-buttons design: one to choose cleaning modes, another to choose strength modes.5 cleaning modes: Clean, Sensitive, Massage,White,PolishWireless ChargingCharging time: within 10 hoursPackage weight:550g(All Date From SAMO Technology Lab)